blogging software that allows video and picture posts, as well as comments to be left on any such post?

ok, so i am a start up website developer, start up as in i am still new at this stuff! so i was wondering is there a software that i can en-cooperate into a website, that will let people post comments on other peoples posts, as well as let them upload videos and pictures? and is all of this free? thank you guys, and

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